Yeah, no issue. Did consider the stock zotac but its a blower which I assumed wouldn't be the best for cooling and noise.
yeah 2x jack 8 pin are not good for your setup.
most of us don't max the cards and the cards only go to 180 watts maxed
even these are nice
https://www.amazon.com/MSI-GTX-1070-TI-AERO/dp/B076QDSVB4/ref=sr_1_3?set to 75% tdp and fans at 75%
they will do close to 500 sols at zec
with 180 core
660 memory
75% tdp and
75% fan.
if you use risers give them a little extra room say a 4 inch gap once installed
best way is use 1 pcie cable into the card and into the riser with an extension like this
https://www.amazon.com/Cable-Matters-2-Pack-6-Pin-Extension/dp/B01DV1Z4EQ/ref=sr_1_8_sspa?the dual cable powers the card and the riser. and 1070 ti will be using around 125 watts for the one cable total.
that is why a single eight pin 1070 ti card is better.